<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <h1>修改商品页面</h1>
  <input type="text" v-model="p.id" placeholder="商品id" readonly>
  <input type="text" v-model="p.title" placeholder="商品标题">
  <input type="text" v-model="p.price" placeholder="商品价格">
  <input type="text" v-model="p.num" placeholder="商品库存">
  <input type="button" value="修改" @click="update()">
</div>
<!--引入axios和vue框架-->
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.6.14/vue.min.js"></script>
<script>
    let v = new Vue({
        el: "body>div",
        data: {
          p:{
            id:"",title:"",price:"",num:""
          }
        },
        methods: {
          update(){
            //发出修改的异步post请求
              axios.post("/update",v.p).then(function (response) {
                  alert("修改完成!");
                  //显示到列表页面
                  location.href="/list.html";
              })
          }
        },
        created:function () {
          //发请求 通过id查询到商品的详情并显示到页面中
          //location.search 得到地址栏中?以及后面的内容    ?id=5
          //最终请求路径是/selectById?id=5
          axios.get("/selectById"+location.search).then(function (response) {
            //把服务器响应的商品对象赋值给v.p 这样页面会自动显示出商品信息
            v.p = response.data;
          })
        }
    })
</script>
</body>
</html>